wilder



(No Model.)

0. H. WILDER'. CORE FOR CASTING ORDNANCE.

N. PETERS, FhumLithngraphnr. Walhingifln. D, Q

UNITED STATES PATENT OFFICE.

CHARLES H. ILDER, OF NATICK, MASSACHUSETTS, ASSIGNOR TO FREDERICK E.ATTEAUX, TRUSTEE.

CORE FOR CASTING ORDNANCE.

SPECIFICATION forming part of Letters Patent No. 404,239, dated May 28,1889.

Application filed March 31,1888. Renewed March 5, 1889. Serial No.302,016. (No model.)

To aZZ whom it may concern.-

Be it known that I, CHARLES H. ILDER, of Natick, in the county ofMiddlesex and State of Massachusetts, a citizen of the United States,have invented certain new and useful Improvements in Cores for CastingOrdnance, of which the following is a specification.

My invention relates to a device for forming the bore or interior ofordnance or for [O analogous articles when the same are made from metalby casting, and its object is to produce such a casting with a boresmooth and free from cracks, flaws, and other defects now ordinarilyfound.

I 5- In carrying out my invention I form a core of the shape anddimensions required for the bore of the article to be cast, which coreconsists of an outer shell of coke, the exterior of which is of the formof the bore to be produced in the cast article, an inner or centralmetallic tube or pipe corresponding in length to the coke shell, and anannular filling of sand interposed between the coke shell and the tube.For convenience in manufacture and manipulation the outer shell of cokemay be made of a number of sections fitted to each other, while theinner tube or shell will prefer. bly be constructed of iron or othersuitable metal and in one piece. This tube acts 0 as a support or stayfor the shell and sand filling, and its interior may be used to conducta flow of water to cool the cast metal after the cast has beenmade. Thefilling of sand between the shell and tube serves to sustain the 3 5shell against the pressure of the melted metal.

In the accompanying drawings I have represented at Figure 1 aperspective of a cylindrical section of coke, several of which puttogether make up the outside coke shell. Fig.

2 shows another view of a coke cylinder, the

top of which is fitted to enter the bottom of the cylinder of Fig. 1.Fig. 3 shows in vertitical longitudinal section a portion of the core,including two sections of the coke cylinders, the central tube, and theintermediate filling of sand. Fig. 4 shows in plan the outer shell, thesand filling, and the inner tube.

The outer shell of coke is marked a. The joint between two sections ofthe outer shell is represented at a. The central tube is marked a andthe annular sand filling a A convenient method of forming or molding thecoke for the outer cylinder .is by first grin ding it, then mixing itwith pitch or coaltar into a plastic mass, then molding it in suitablemolds to give it the desired form to produce the bore of the article tobe cast, and, lastly, heating the formed coke in a mass of sand in aclosed furnace until the whole is recoked, whereupon, upon being cooled,it is ready for use.

It will be understood that my improved core is intended to be used invertical position and in connection with a vertical mold for forming theoutside of the article to be cast. After the casting has been made andhas cooled the outside of the mold may be removed, the inner tube of thecore may be withdrawn, and the outer coke tube and sand may be removedin any convenient manner.

I claim The above-described core for use in casting ordnance andanalogous articles, it consisting in an outer shell of coke, a centralmetallic tube, and a filling of sand between the shell and the tube, allsubstantially as described.

CHARLES H. XVILDER. lVitnesses:

WVM. E. PEABODY,

CHS. HOUGHTEN.

